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Communications
Class Information
Number:
181/31B
Name:
Acoustics
>
Description:
Sub-classes under this class:
Class Number
Class Name
Patents
181/
Speaking tubes
0
181/.5
Miscellaneous
96
181/101
Geophysical or subsurface exploration
36
181/123
Echo system
9
181/125
Sound location
8
181/126
Anatomic or prosthetic relation
23
181/138
Mechanical telephone
6
181/139
Wave generation and detection
25
181/140
With vessel
16
181/141
Combined
142
181/142
Wave generation
50
181/143
Moving sound producer or deflector
12
181/144
Plural diaphragm sound sources
231
181/148
Diaphragm and enclosure
193
181/157
Diaphragm
59
181/175
Sound-modifying means
135
181/30
Auditorium
60
181/400
Wave coupling
19
181/403
Refrigerator compresssor muffler
169
181/404
Hobby craft engine muffler
4
Patents under this class:
Patent Number
Title Of Patent
Date Issued
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